TOMOYO: Add refcounter on string data.
Add refcounter to "struct tomoyo_name_entry" and replace tomoyo_save_name()
with tomoyo_get_name()/tomoyo_put_name() pair so that we can kfree() when
garbage collector is added.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/security/tomoyo/domain.c b/security/tomoyo/domain.c
index 229de1e..0b82625 100644
--- a/security/tomoyo/domain.c
+++ b/security/tomoyo/domain.c
@@ -203,7 +203,7 @@
{
struct tomoyo_domain_initializer_entry *entry = NULL;
struct tomoyo_domain_initializer_entry *ptr;
- const struct tomoyo_path_info *saved_program;
+ const struct tomoyo_path_info *saved_program = NULL;
const struct tomoyo_path_info *saved_domainname = NULL;
int error = is_delete ? -ENOENT : -ENOMEM;
bool is_last_name = false;
@@ -216,11 +216,11 @@
is_last_name = true;
else if (!tomoyo_is_correct_domain(domainname, __func__))
return -EINVAL;
- saved_domainname = tomoyo_save_name(domainname);
+ saved_domainname = tomoyo_get_name(domainname);
if (!saved_domainname)
goto out;
}
- saved_program = tomoyo_save_name(program);
+ saved_program = tomoyo_get_name(program);
if (!saved_program)
goto out;
if (!is_delete)
@@ -237,7 +237,9 @@
}
if (!is_delete && error && tomoyo_memory_ok(entry)) {
entry->domainname = saved_domainname;
+ saved_domainname = NULL;
entry->program = saved_program;
+ saved_program = NULL;
entry->is_not = is_not;
entry->is_last_name = is_last_name;
list_add_tail_rcu(&entry->list,
@@ -247,6 +249,8 @@
}
mutex_unlock(&tomoyo_policy_lock);
out:
+ tomoyo_put_name(saved_domainname);
+ tomoyo_put_name(saved_program);
kfree(entry);
return error;
}
@@ -419,7 +423,7 @@
{
struct tomoyo_domain_keeper_entry *entry = NULL;
struct tomoyo_domain_keeper_entry *ptr;
- const struct tomoyo_path_info *saved_domainname;
+ const struct tomoyo_path_info *saved_domainname = NULL;
const struct tomoyo_path_info *saved_program = NULL;
int error = is_delete ? -ENOENT : -ENOMEM;
bool is_last_name = false;
@@ -432,11 +436,11 @@
if (program) {
if (!tomoyo_is_correct_path(program, 1, -1, -1, __func__))
return -EINVAL;
- saved_program = tomoyo_save_name(program);
+ saved_program = tomoyo_get_name(program);
if (!saved_program)
goto out;
}
- saved_domainname = tomoyo_save_name(domainname);
+ saved_domainname = tomoyo_get_name(domainname);
if (!saved_domainname)
goto out;
if (!is_delete)
@@ -453,7 +457,9 @@
}
if (!is_delete && error && tomoyo_memory_ok(entry)) {
entry->domainname = saved_domainname;
+ saved_domainname = NULL;
entry->program = saved_program;
+ saved_program = NULL;
entry->is_not = is_not;
entry->is_last_name = is_last_name;
list_add_tail_rcu(&entry->list, &tomoyo_domain_keeper_list);
@@ -462,6 +468,8 @@
}
mutex_unlock(&tomoyo_policy_lock);
out:
+ tomoyo_put_name(saved_domainname);
+ tomoyo_put_name(saved_program);
kfree(entry);
return error;
}
@@ -623,8 +631,8 @@
if (!tomoyo_is_correct_path(original_name, 1, -1, -1, __func__) ||
!tomoyo_is_correct_path(aliased_name, 1, -1, -1, __func__))
return -EINVAL; /* No patterns allowed. */
- saved_original_name = tomoyo_save_name(original_name);
- saved_aliased_name = tomoyo_save_name(aliased_name);
+ saved_original_name = tomoyo_get_name(original_name);
+ saved_aliased_name = tomoyo_get_name(aliased_name);
if (!saved_original_name || !saved_aliased_name)
goto out;
if (!is_delete)
@@ -640,13 +648,17 @@
}
if (!is_delete && error && tomoyo_memory_ok(entry)) {
entry->original_name = saved_original_name;
+ saved_original_name = NULL;
entry->aliased_name = saved_aliased_name;
+ saved_aliased_name = NULL;
list_add_tail_rcu(&entry->list, &tomoyo_alias_list);
entry = NULL;
error = 0;
}
mutex_unlock(&tomoyo_policy_lock);
out:
+ tomoyo_put_name(saved_original_name);
+ tomoyo_put_name(saved_aliased_name);
kfree(entry);
return error;
}
@@ -721,7 +733,7 @@
if (!tomoyo_is_correct_domain(domainname, __func__))
return NULL;
- saved_domainname = tomoyo_save_name(domainname);
+ saved_domainname = tomoyo_get_name(domainname);
if (!saved_domainname)
return NULL;
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
@@ -736,6 +748,7 @@
if (!found && tomoyo_memory_ok(entry)) {
INIT_LIST_HEAD(&entry->acl_info_list);
entry->domainname = saved_domainname;
+ saved_domainname = NULL;
entry->profile = profile;
list_add_tail_rcu(&entry->list, &tomoyo_domain_list);
domain = entry;
@@ -743,6 +756,7 @@
found = true;
}
mutex_unlock(&tomoyo_policy_lock);
+ tomoyo_put_name(saved_domainname);
kfree(entry);
return found ? domain : NULL;
}